Comtest Networks 3432 POTS/ISDN Splitter Shelf User Manual

Comtest Networks Communication

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Model 3432 POTS/ISDN Splitter Shelf Installation Guide

Copyright © 2008,

Comtest Networks Inc.

This guide provides the basic information required to install the Comtest Model 3432 POTS/ISDN Splitter Shelf
in a Central Office location.

Installation

The 3432 requires 9U (15½ inches) of rack space. The
shelf is supplied with mounting brackets and hardware to
allow installation in a 19 inch or 23 inch rack. By
repositioning the mounting brackets, the shelf can be
installed with the connectors front or rear facing. With the
connectors facing the front, a depth of 10 inches would be
sufficient to mount the shelf with cables installed.

Grounding

To comply with the Network Equipment Building Systems
(NEBS) requirements, a suitable ground must be provided.
The 33432 is to be grounded to the rack, with the use of a
separate a ground wire, through the ground point at the
right side of the shelf.

Cabling Overview

The 3432 Splitter Shelf cabling configurations will vary depending on installation locations and the number of
lines supported by the DSLAM. However, the physical interface to the Front Panel connectors are standard 50-
pin RJ-21 type receptacle connectors. Each Splitter card uses 24 pairs of the 25 pairs available on each 50-pin
connector.

Connector Pin Outs

As view from the front of the shelf:

• ADSL signals to and from the DSLAM enter the 3432 splitter shelf using the top most telephone

connectors, designated ‘DSL’ interface.

• Signals to and from the LINE (outside plant) enter the 3432 splitter shelf using the centre

telephone connectors, designated ‘LINE’ interface.

• Cables to and from the central office switch enter the 3432 splitter shelf via the lower most

telephone connectors, designated ‘PSTN’ interface.

LINE

PSTN

DSL

GROUND

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